<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <=2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >Append</el-button>
          <el-button type="text" size="mini" @click="edit(data)">edit</el-button>
          <el-button
            v-if="node.childNodes.length==0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >Delete</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  // 这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
  // 例如：import《组件名称》from'《组件路径》';

  export default {
    // import引入的组件需要注入到对象中才能使用
    components: {},
    props: {},
    data () {
      return {
        pCid: [],
        draggable: false,
        updateNodes: [],
        maxLevel: 0,
        title: '',
        dialogType: '', // edit,add
        category: {
          name: '',
          parentCid: 0,
          catLevel: 0,
          showStatus: 1,
          sort: 0,
          productUnit: '',
          icon: '',
          catId: null
        },
        dialogVisible: false,
        menus: [],
        expandedKey: [],
        defaultProps: {
          children: 'children',
          label: 'name'
        }
      }
    },

    // 计算属性类似于data概念
    computed: {},
    // 监控data中的数据变化
    watch: {},
    // 方法集合
    methods: {
      getMenus () {
        this.$http({
          url: this.$http.adornUrl('/product/category/list/tree'),
          method: 'get'
        }).then(({data}) => {
          console.log('成功获取到菜单数据...', data.data)
          this.menus = data.data
        })
      },
      batchDelete () {
        let catIds = []
        let checkedNodes = this.$refs.menuTree.getCheckedNodes()
        console.log('被选中的元素', checkedNodes)
        for (let i = 0; i < checkedNodes.length; i++) {
          catIds.push(checkedNodes[i].catId)
        }
        this.$confirm(`是否批量删除【${catIds}】菜单?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        })
          .then(() => {
            this.$http({
              url: this.$http.adornUrl('/product/category/delete'),
              method: 'post',
              data: this.$http.adornData(catIds, false)
            }).then(({data}) => {
              this.$message({
                message: '菜单批量删除成功',
                type: 'success'
              })
              this.getMenus()
            })
          })
          .catch(() => {
          })
      },
      batchSave () {
        this.$http({
          url: this.$http.adornUrl('/product/category/update/sort'),
          method: 'post',
          data: this.$http.adornData(this.updateNodes, false)
        }).then(({data}) => {
          this.$message({
            message: '菜单顺序等修改成功',
            type: 'success'
          })
          // 刷新出新的菜单
          this.getMenus()
          // 设置需要默认展开的菜单
          this.expandedKey = this.pCid
          this.updateNodes = []
          this.maxLevel = 0
          //  this.pCid = 0;
        })
      },
      handleDrop (draggingNode, dropNode, dropType, ev) {
        console.log('handleDrop: ', draggingNode, dropNode, dropType)
        // 1、当前节点最新的父节点id
        let pCid = 0
        let siblings = null
        if (dropType === 'before' || dropType === 'after') {
          pCid =
            dropNode.parent.data.catId === undefined
              ? 0
              : dropNode.parent.data.catId
          siblings = dropNode.parent.childNodes
        } else {
          pCid = dropNode.data.catId
          siblings = dropNode.childNodes
        }
        this.pCid.push(pCid)

        // 2、当前拖拽节点的最新顺序，
        for (let i = 0; i < siblings.length; i++) {
          if (siblings[i].data.catId === draggingNode.data.catId) {
            // 如果遍历的是当前正在拖拽的节点
            let catLevel = draggingNode.level
            if (siblings[i].level !== draggingNode.level) {
              // 当前节点的层级发生变化
              catLevel = siblings[i].level
              // 修改他子节点的层级
              this.updateChildNodeLevel(siblings[i])
            }
            this.updateNodes.push({
              catId: siblings[i].data.catId,
              sort: i,
              parentCid: pCid,
              catLevel: catLevel
            })
          } else {
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i})
          }
        }

        // 3、当前拖拽节点的最新层级
        console.log('updateNodes', this.updateNodes)
      },
      updateChildNodeLevel (node) {
        if (node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            var cNode = node.childNodes[i].data
            this.updateNodes.push({
              catId: cNode.catId,
              catLevel: node.childNodes[i].level
            })
            this.updateChildNodeLevel(node.childNodes[i])
          }
        }
      },
      allowDrop (draggingNode, dropNode, type) {
        // 1、被拖动的当前节点以及所在的父节点总层数不能大于3

        // 1）、被拖动的当前节点总层数
        console.log('allowDrop:', draggingNode, dropNode, type)
        //
        this.countNodeLevel(draggingNode)
        // 当前正在拖动的节点+父节点所在的深度不大于3即可
        let deep = Math.abs(this.maxLevel - draggingNode.level) + 1
        console.log('深度：', deep)

        //    this.maxLevel
        if (type === 'inner') {
          //  console.log(
          //    `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
          //  );
          return deep + dropNode.level <= 3
        } else {
          return deep + dropNode.parent.level <= 3
        }
      },
      countNodeLevel (node) {
        // 找到所有子节点，求出最大深度
        if (node.childNodes != null && node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            if (node.childNodes[i].level > this.maxLevel) {
              this.maxLevel = node.childNodes[i].level
            }
            this.countNodeLevel(node.childNodes[i])
          }
        }
      },
      edit (data) {
        console.log('要修改的数据', data)
        this.dialogType = 'edit'
        this.title = '修改分类'
        this.dialogVisible = true

        // 发送请求获取当前节点最新的数据
        this.$http({
          url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
          method: 'get'
        }).then(({data}) => {
          // 请求成功
          console.log('要回显的数据', data)
          this.category.name = data.data.name
          this.category.catId = data.data.catId
          this.category.icon = data.data.icon
          this.category.productUnit = data.data.productUnit
          this.category.parentCid = data.data.parentCid
          this.category.catLevel = data.data.catLevel
          this.category.sort = data.data.sort
          this.category.showStatus = data.data.showStatus
          /**
           *         parentCid: 0,
           catLevel: 0,
           showStatus: 1,
           sort: 0,
           */
        })
      },
      append (data) {
        console.log('append', data)
        this.dialogType = 'add'
        this.title = '添加分类'
        this.dialogVisible = true
        this.category.parentCid = data.catId
        this.category.catLevel = data.catLevel * 1 + 1
        this.category.catId = null
        this.category.name = ''
        this.category.icon = ''
        this.category.productUnit = ''
        this.category.sort = 0
        this.category.showStatus = 1
      },

      submitData () {
        if (this.dialogType === 'add') {
          this.addCategory()
        }
        if (this.dialogType === 'edit') {
          this.editCategory()
        }
      },
      // 修改三级分类数据
      editCategory () {
        var {catId, name, icon, productUnit} = this.category
        this.$http({
          url: this.$http.adornUrl('/product/category/update'),
          method: 'post',
          data: this.$http.adornData({catId, name, icon, productUnit}, false)
        }).then(({data}) => {
          this.$message({
            message: '菜单修改成功',
            type: 'success'
          })
          // 关闭对话框
          this.dialogVisible = false
          // 刷新出新的菜单
          this.getMenus()
          // 设置需要默认展开的菜单
          this.expandedKey = [this.category.parentCid]
        })
      },
      // 添加三级分类
      addCategory () {
        console.log('提交的三级分类数据', this.category)
        this.$http({
          url: this.$http.adornUrl('/product/category/save'),
          method: 'post',
          data: this.$http.adornData(this.category, false)
        }).then(({data}) => {
          this.$message({
            message: '菜单保存成功',
            type: 'success'
          })
          // 关闭对话框
          this.dialogVisible = false
          // 刷新出新的菜单
          this.getMenus()
          // 设置需要默认展开的菜单
          this.expandedKey = [this.category.parentCid]
        })
      },

      remove (node, data) {
        var ids = [data.catId]
        this.$confirm(`是否删除【${data.name}】菜单?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        })
          .then(() => {
            this.$http({
              url: this.$http.adornUrl('/product/category/delete'),
              method: 'post',
              data: this.$http.adornData(ids, false)
            }).then(({data}) => {
              this.$message({
                message: '菜单删除成功',
                type: 'success'
              })
              // 刷新出新的菜单
              this.getMenus()
              // 设置需要默认展开的菜单
              this.expandedKey = [node.parent.data.catId]
            })
          })
          .catch(() => {
          })

        console.log('remove', node, data)
      }
    },
    // 生命周期-创建完成（可以访问当前this实例）
    created () {
      this.getMenus()
    },
    // 生命周期-挂载完成（可以访问DOM元素）
    mounted () {
    },
    beforeCreate () {
    }, // 生命周期-创建之前
    beforeMount () {
    }, // 生命周期-挂载之前
    beforeUpdate () {
    }, // 生命周期-更新之前
    updated () {
    }, // 生命周期-更新之后
    beforeDestroy () {
    }, // 生命周期-销毁之前
    destroyed () {
    }, // 生命周期-销毁完成
    activated () {
    } // 如果页面有keep-alive缓存功能，这个函数会触发
  }
</script>
